74HCT123 查看數據表（PDF） - Philips Electronics
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74HCT123 Datasheet PDF : 17 Pages
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Philips Semiconductors
Dual retriggerable monostable
multivibrator with reset
Product specification
74HC/HCT123
AC CHARACTERISTICS FOR 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF
Tamb (°C)
TEST CONDITIONS
SYMBOL
PARAMETER
74HCT
+25
−40 to +85
−40 to +125
UNIT VCC
(V)
min. typ. max. min. max. min. max.
WAVEFORMS/
NOTES
tPHL
propagation delay
nRD, nA, nB to nQ
30 51
64
77
ns
4.5
CEXT = 0 pF;
REXT = 5 kΩ
tPLH
propagation delay
nRD, nA, nB to nQ
28 51
64
77
ns
4.5
CEXT = 0 pF;
REXT = 5 kΩ
tPHL
propagation delay
nRD to nQ (reset)
27 46
58
69
ns
4.5
CEXT = 0 pF;
REXT = 5 kΩ
tPLH
propagation delay
nRD to nQ (reset)
23 46
58
69
ns
4.5
CEXT = 0 pF;
REXT = 5 kΩ
tTHL / tTLH output transition time
7 15
19
22 ns 4.5
tW
trigger pulse width
nA = LOW
20 3
25
30
ns 4.5 Fig.7
tW
trigger pulse width
nB = HIGH
20 5
25
30
ns 4.5 Fig.7
tW
reset pulse width
nRD = LOW
20 7
25
30
output pulse width
tW
nQ = HIGH
nQ = LOW
450
−
−
ns 4.5 Fig.8
CEXT = 100 nF;
µs 5.0 REXT = 10 kΩ;
Figs 7 and 8
output pulse width
tW
nQ = HIGH
75
−
−
nQ = LOW
CEXT = 0 pF;
ns 5.0 REXT = 5 kΩ;
note 1; Figs 7 and 8
trt
retrigger time
nA, nB
110
−
−
CEXT = 0 pF;
ns 5.0 REXT = 5 kΩ;
note 2; Fig.7
REXT
external timing
resistor
2
1000 −
−
kΩ 5.0 Fig.9
CEXT
external timing
capacitor
no limits
pF 5.0 Fig.9; note 3
1998 Jul 08
8
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